成为专家：HeadFirst Android Development

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"Professional Android Development 书籍" 《HeadFirst Android Development》是一本专注于Android应用开发的专业书籍，由Jonathan Simon撰写，旨在以一种引人入胜、寓教于乐的方式帮助读者成为Android开发专家。该书由O'Reilly Media, Inc.出版，适合教育、商业或销售推广使用，同时也有在线版本可供选择。这本书由Kathy Sierra和Bert Bates创建的HeadFirst系列，以其独特的学习风格而闻名，将复杂的概念通过可视化、互动和有趣的方式呈现，使读者在轻松愉快的氛围中掌握专业知识。编辑Brian Sawyer参与了书籍的制作，封面设计由Karen Montgomery负责，整个生产过程由一系列专业人士协作完成，包括生产编辑、索引编制者和校对员等。书中内容可能涵盖了Android开发的各个方面，包括但不限于： 1. **Android环境设置**：如何安装和配置Android Studio，以及设置模拟器或连接真实设备进行开发测试。 2. **Android应用程序结构**：介绍Android应用程序的基本组件，如Activity、Intent、Broadcast Receiver、Service和Content Provider，以及它们之间的交互。 3. **用户界面设计**：讲解XML布局文件的使用，以及如何使用Material Design创建美观的用户界面。 4. **数据存储**：涵盖SQLite数据库的使用，SharedPreferences以及如何使用文件系统进行数据持久化。 5. **网络通信**：介绍如何使用HttpURLConnection或OkHttp进行网络请求，以及处理JSON或XML数据。 6. **多媒体与传感器**：讲解如何集成音频、视频和图像处理，以及利用手机传感器（如GPS、加速度计）实现相关功能。 7. **通知与推送**：如何创建本地通知，以及集成Google Cloud Messaging (GCM) 或Firebase Cloud Messaging (FCM) 实现实时推送。 8. **多线程与异步任务**：介绍AsyncTask，Handler，以及使用IntentService处理后台任务的方法。 9. **性能优化**：包括内存管理、性能分析工具的使用，以及如何编写高效的代码。 10. **测试与调试**：讲解如何编写单元测试，使用Android Studio的调试工具，以及进行Monkey测试和压力测试。 11. **发布与市场**：指导如何准备应用程序上线，理解Google Play Store的政策，以及如何进行应用的推广。通过阅读《HeadFirst Android Development》，读者不仅可以掌握Android开发的基础知识，还能深入了解实践中的问题和解决方案，从而提升自己的专业技能，成为真正的Android开发专家。无论你是初学者还是有经验的开发者，这本书都能提供有价值的洞见和指导。

xvi intro

how to use this book

Here’s what WE did:

We used pictures, because your brain is tuned for visuals, not text. As far as your brain’s

concerned, a picture really is worth a thousand words. And when text and pictures work

together, we embedded the text in the pictures because your brain works more effectively

when the text is within the thing the text refers to, as opposed to in a caption or buried in the

text somewhere.

We used redundancy, saying the same thing in different ways and with different media types,

and multiple senses, to increase the chance that the content gets coded into more than one area

of your brain.

We used concepts and pictures in unexpected ways because your brain is tuned for novelty,

and we used pictures and ideas with at least some emotional content, because your brain

is tuned to pay attention to the biochemistry of emotions. That which causes you to feel

something is more likely to be remembered, even if that feeling is nothing more than a little

humor, surprise, or interest.

We used a personalized, conversational style, because your brain is tuned to pay more

attention when it believes you’re in a conversation than if it thinks you’re passively listening

to a presentation. Your brain does this even when you’re reading.

We included more than 80 activities, because your brain is tuned to learn and remember

more when you do things than when you read about things. And we made the exercises

challenging-yet-do-able, because that’s what most people prefer.

We used multiple learning styles, because you might prefer step-by-step procedures, while

someone else wants to understand the big picture first, and someone else just wants to see

an example. But regardless of your own learning preference, everyone benefits from seeing the

same content represented in multiple ways.

We include content for both sides of your brain, because the more of your brain you

engage, the more likely you are to learn and remember, and the longer you can stay focused.

Since working one side of the brain often means giving the other side a chance to rest, you

can be more productive at learning for a longer period of time.

And we included stories and exercises that present more than one point of view,

because your brain is tuned to learn more deeply when it’s forced to make evaluations and

judgments.

We included challenges, with exercises, and by asking questions that don’t always have

a straight answer, because your brain is tuned to learn and remember when it has to work at

something. Think about it—you can’t get your body in shape just by watching people at the

gym. But we did our best to make sure that when you’re working hard, it’s on the right things.

That you’re not spending one extra dendrite processing a hard-to-understand example,

or parsing difficult, jargon-laden, or overly terse text.

We used people. In stories, examples, pictures, etc., because, well, because you’re a person.

And your brain pays more attention to people than it does to things.

you are here 4 xvii

the intro

So, we did our part. The rest is up to you. These tips are a

starting point; listen to your brain and figure out what works

for you and what doesn’t. Try new things.

Drink water. Lots of it.

Your brain works best in a nice bath of fluid.

Dehydration (which can happen before you ever

feel thirsty) decreases cognitive function.

Get your hands dirty!

There’s only one way to learn to Android: get

your hands dirty. And that’s what you’re going to

do throughout this book. Android Development

is a skill, and the only way to get good at it is to

practice. We’re going to give you a lot of practice:

every chapter has exercises that pose a problem for

you to solve. Don’t just skip over them—a lot of the

learning happens when you solve the exercises. We

included a solution to each exercise—don’t be afraid

to peek at the solution if you get stuck! (It’s easy to

get snagged on something small.) But try to solve

the problem before you look at the solution. And

definitely get it working before you move on to the

next part of the book.

Feel something.

Your brain needs to know that this matters. Get

involved with the stories. Make up your own

captions for the photos. Groaning over a bad joke

is still better than feeling nothing at all.

Listen to your brain.

Pay attention to whether your brain is getting

overloaded. If you find yourself starting to skim

the surface or forget what you just read, it’s time

for a break. Once you go past a certain point, you

won’t learn faster by trying to shove more in, and

you might even hurt the process.

Talk about it. Out loud.

Speaking activates a different part of the brain. If

you’re trying to understand something, or increase

your chance of remembering it later, say it out loud.

Better still, try to explain it out loud to someone else.

You’ll learn more quickly, and you might uncover

ideas you hadn’t known were there when you were

reading about it.

Make this the last thing you read before bed.

Or at least the last challenging thing.

Part of the learning (especially the transfer to

long-term memory) happens

after

you put the book

down. Your brain needs time on its own, to do more

processing. If you put in something new during that

processing time, some of what you just learned will

be lost.

Read the “There are No Dumb Questions”

That means all of them. They’re not optional

sidebars, they’re part of the core content!

Don’t skip them.

Cut this out and stick

it on your refrigerator.

Here’s what YOU can do to bend

your brain into submission

Do the exercises. Write your own notes.

We put them in, but if we did them for you, that

would be like having someone else do your workouts

for you. And don’t just look at the exercises. Use a

pencil. There’s plenty of evidence that physical

activity

while

learning can increase the learning.

Don’t just read. Stop and think. When the book asks

you a question, don’t just skip to the answer. Imagine

that someone really is asking the question. The

more deeply you force your brain to think, the better

chance you have of learning and remembering.

Slow down. The more you understand, the

less you have to memorize.

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